Editor's Note: Gallup re-estimated its Gallup-Healthways Well-Being Index and Life Evaluation Index data from January 2008 to April 2009 to address context effects that Gallup discovered after the data were originally published.

Residents of Hawaii and North Dakota had the lowest stress levels in the nation in the first half of 2009, while Kentucky and West Virginia residents had the highest stress levels. States with residents that are less stressed tend to have happier residents, but this is not always the case.